Inshore migration of the tropical eels Anguilla spp. recruiting to the Poigar River estuary on north Sulawesi Island
Inshore migration of the tropical eels Anguilla spp. recruiting to the Poigar River estuary on north Sulawesi Island
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DOI：
10.3354/meps221233
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发表时间：
2001-01-01
影响因子：
2.5
通讯作者：
Tsukamoto, K
中科院分区：
文献类型：
--
作者：
Sugeha, HY;Arai, T;Tsukamoto, K
为了了解热带鳗鱼，安圭拉属，从1997年到1999年，我们在印度尼西亚北苏拉威西岛的波伊加河口每月收集32836条玻璃鳗鱼。根据形态特征对标本进行鉴定，共鉴定出3种，即A. celebesensis，A. marmorata和A. bicolor pacifica，每年的数量都在波动。A. celebesensis是最丰富的物种，包括73.5，79.5，和81.9%的所有玻璃鳗鱼招募到河口的Poigar河在1997年，1998年和1999年，分别。该物种在所有3年中相对丰富，在1997年和1998年6月以及1999年9月期间达到高峰。A. marmorata是第二丰富的物种，分别占年捕获量的23.8%、18.8%和17.7%，并在1997年和1998年6月以及1999年1月达到丰度峰值。A.太平洋双色鱼分别只占全年渔获量的2.7%、1.7%和0.3%，其渔获量高峰分别在1997年6月、1998年1月和1999年1月和2月。A. celebesensis和A.在1997年、1998年和1999年，几乎全年都在收集花鳗鲡，这表明与从冬季到春季的半年中进行补充的温带鳗鱼不同，这些热带鳗鱼物种在某种程度上全年都在补充。玻璃鳗显然是更丰富的新月采样事件，与3075，183，3，和90个玻璃鳗收集在10个采样期间，在新月，满月，满月和残月，分别。在夜间（18：00 ~ 05：00 h），当光照强度为0 ~ 1.86 lux时，采集所有玻璃鳗;在白天（06：00 ~ 17：00 h），当光照强度为500 ~ 150000 lux时，不采集玻璃鳗。新月期间，涨潮时采集的玻璃鳗数量多于落潮时。这些结果表明，大量的玻璃鳗鱼招募到波伊加尔河口在夜间，新月和涨潮期间。
To understand ecological and behavioral aspects of inshore migration of tropical eels, Anguilla spp., we collected 32836 glass eels in the Poigar River estuary on north Sulawesi Island, Indonesia, in monthly collections from 1997 to 1999. The specimens were identified using morphological characters, and 3 species, A. celebesensis, A. marmorata, and A. bicolor pacifica, were found each year in fluctuating abundances. A. celebesensis was the most abundant species and comprised 73.5, 79.5, and 81.9% of all glass eels recruiting to the estuary of the Poigar River in 1997, 1998, and 1999, respectively. This species was relatively abundant in all 3 years with peaks during June in 1997 and 1998, and during September in 1999. A. marmorata was the second most abundant species and comprised 23.8, 18.8, and 17.7% of the yearly catches, respectively, and reached peaks in abundance during June in 1997 and 1998, and during January in 1999. A. bicolor pacifica comprised only 2.7, 1.7, and 0.3% of the yearly catches, respectively, with peak catches in June in 1997, in January in 1998, and in January and February in 1999. A. celebesensis and A. marmorata were collected almost throughout the year in 1997, 1998, and 1999, suggesting that in contrast to the temperate eels that recruit during half the year from winter to spring, these tropical eel species recruit to some degree throughout the year. Glass eels clearly were more abundant during new moon sampling events, with a total of 3075, 183, 3, and 90 glass eels collected in 10 sampling periods during new moon, waxing moon, full moon, and waning moon, respectively. All glass eels were collected at night (18:00 to 05:00 h) when light intensity ranged from 0 to 1.86 lux, and no glass eels were collected during the day (06:00 to 17:00 h) when light intensity ranged from 500 to 150000 lux. During new moon, more glass eels were collected during flood tide than during ebb tide. These results suggest that a greater number of glass eels recruited to the Poigar River estuary at night, during new moon and during flood tide.